kassner



July 10, 1928. 1,676,559

E. KAssNER DUPLEX ADDING MACHINE AND CASH REGISTER Filed April 30, 19 25 ERNST mas/v52 atboz "my Patented July 10, 1928.

UNITED STATES PATENT OFFICE.

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nuPLnx ADDING MAoninnAnn CASH REGISTER.

Application filed April 30,1925", Serial No. 26;875, and in Germany May 1, I924.

The invention relates to a calculating machine or the like with two" or more counters, in which an actuating member is shifted through different ranges of move ment corresponding with the denomination of the key depressed, and themovement of the actuating member is transmitted by: a link to a drive lever pivotally supported between two counters. As the drive lever is shifted to either of two operative positions to bring it into engagement with one or the other of the two counters, it has heretofore'occurred that inaccuracies were produced in transmittingthe movement of the actuating member to the counters, which The equalizing means consists of a ointed' lever connecting the drive lever with the link.

The jointed-lever is also pivoted on a shiftable carrying member on which the drive to lever is mounted, so that the jointed-lever is shifted along withthe drive lever. In this manner two quadrangles for the transmission of the movement are produced. The smaller one of these quadrangles does not change its shape when the carrying member is shifted from one position to another and only the larger quadrangle is distorted by the shifting between the two operative positions, which distortion does not influence the final results.

An embodiment is shown in the drawings:

Fig. 1 is a fragmentary view showing a cross section through an adding machine;

Fig. 2 shows in larger scale the connection between the actuating member and the drive lever;

Figs. 3 and 4 are diagrams showing the transmission between the two members with out and with the insertion of a jointed-lever between the drive lever and the link.

In the embodiment shown, the actuating member 1 (Fig. 1) is controlled by mechanism not shown which connects it with the keys 3 as shown in my copending application filed May 27, 1925, Serial No. 33,156. The actuating member is oscillated by the shaft 1, in accordance with the denomination" of the depressed key 3. A link 6 is pivoted at 2 to the actuating member '1 and is connected at its other end through a series of. links to a. drive, lever7, which in turn is pivoted at 19 to a carrying-member 9, the" latter being pivoted to the frame of the machine at 8. Member 7 comprises a seg-' mental gear 18 which is in mesh with an intermediate gear 10, also mounted on said carrying member 9. Through said gear 10 the swinging movement of the actuating member 1 is transmitted to the forward counter or to the rear counter, depending on the position of the member 9. In Fig. 1",. the intermediate gear 10 is in engagement with the drive gear 11 of the front counter. he other position, in whichthe gear 10 is in engagement with the drive member 12 of the rear counter is shown in dotted lines in Fig. 1.

Fig. 3 shows schematically that where link 6 is pivoted directly to drive lever 7 errors are produced in the transmission of the swinging movement of the actuating memher to the drive lever 7. V

In this figure the solid lines represent the members 1, 6 and 7 in the approximate positions shown in Fig. 1, lever 7 being in its forward position. If member 1 is now moved from its zero position to its 9 position,.it takes up the position designated as 1, and members 6 and 7 move to positions 6 and 7 causing member 7 to move through a. certain angle M. But if, while member 1 is in its Zero position, carrying member 9 is shifted to its rear position, member 7 is moved to position 7 and upon movement of member 1 to position 1 as before, members 6 and'7 are caused to move to positions 6 and 7, lever 7 moving through an angle N, which is not the same as angle M, but is smaller by the amount of are 0. The angular movement of lever 7 therefore varies with the position (forward or rear) which thelever is in at the time of actuation of member 1, and a corresponding error is pro-, duced in the rotation of member 11 or 12, which error may amount to one unit, especially when the machine is operated at high speed.

The defects arising from a directconnection are according to the present invention eliminated by the introduction of meansbe: tween the lever 7 and the connecting link 6. This means equalizes the swinging movement of the "lever 7 to eliminate the error above discussed, and consists of a jointedlever 14, 15, connecting the link 6 and the intermediate member 7. The jointed-lever is pivoted at 13 on the carrying member 9 (Figs. 1 and 2) and comprises a lever 14 pilvotally supported by frame 9 and pivotal 1 5, the latter being pivoted to said lever 14 at 21 and to the intermediate member 7 at 22. As seen in Fig. 4, the solid lines represent members 1, 6, 14 and 7 approximately in the positions shown in Fig. 1, lever 7 being in itst'orward position. The showing of Fig. 4 does not correspond precisely to Fig. 1 as to the shapes and dimensions .01? the members, but clearly illustrates the principle involved. It member 1 is now moved from its zero position to its 9 position, it takes up the position designated as 1, and member 14 is moved through a certain angle P tothe position 14 But if, While member 1 is in its zero position, carrying member 9 is shifted to its rear position, members 6, 14 and 7 are moved to positions 6*, 14 and 7 whereupon movement of member 1 to position 1 causes members 6 and 14 to move to positions 6 and 14, member 14 moving through an angle Q, which is equal to angle I In all positions, lever 7 is held in parallelism with member 14, so that it moves through the same angle as member 14, with the result that its movement, like that of member 14, is substantially independent of theshi'lting of the carrying member from forward to rear position and vice versa. The result is that gears 11 and 12 are rotated in equal amounts, this result being chiefly due to the fact that arcs P and Q intersect near their midsections.

As shown in Fig. 2, the provision of the j ointed-lever has made it possible to arrange connected to link 6 at and a link" all pivots in such a manner that the same are moved in circles concentric to the pivot 8 of frame 9, when said frame is swung about its pivot, so that the movement of lever 7 is not influenced any more, when swinging it from one to the other of its end positions.

WVhat I claim is:

1. In a calculating machine, a pair of spaced gears, 'a pivoted carrying member, a drive lever pivoted to said carrying member and movable therewith to two operative positions, means carried by said carrying member and connected to said drive lever for selectively rotating said gears, and means for oscillating said lever when in either operative-position, comprising a link arranged to be moved longitudinally through predetermined distances, a connecting lever pivoted to said carrying member and to said link and substantially parallel with said drive lever, and a second conecting lever pivoted to said first mentioned connecting,

lever and to said drive lever.

2. In a calculating machine, counting mechanism comprising a pair of spaced gears, a drive lever, a carrying member supporting said drive lever and operative to move the same to either of two operative posit-ions, means caried by said carrying member and connected to said drive lever for selectively rotating said gears, and means for oscillating said lever when in either operative position, comprisinga link arranged to be moved longitudinally through predetermined distances, a connecting lever pivoted to said carrying member and to said link, and a connection between said con-. necting lever and said drive lever whereby they are caused to move in unison.

In testimony whereof I afiix my signature.

ERNST KASSNER. v 

